Propeller



Patented Get. 17, 1922.

#rr-EAD stares 'i' e FM THOMAS a.' MACMECHEN, oruisvvaak,A New JERSEY.

PROPELLER.

i ppliicato'n Vled .T1 11y`8, 1921. vSerial No. 483,288.

' To all whom it concerti,"

lBe it known that I, TrroMAs Rf. MnoMnq oHnNLa citizen ofthe United States, resid- Y -ing "at Newark, in the countyfof Essex and lState of NewfJersey, have invented new and y useful vImprovements in a Propeller, ofl

which the following isfa specification.

" This inventionrelates'topropellers or fans vand analogous devices used for purposes of provision of a propellerL or Vfan 'character-- i Aized by blades ofuniform vconcavo-convex at eachend but open on thepinnerw side orV Vcrossse'ction throughout their" entire length which are so-mountedrelative to the hub l. thatl when in rotation theycreate what mayv be termed open ended buckets-lopen not only surface facing the axis'A of rotation..`

" Affur'ther y object "of this-'invention is toprovide a propeller or -fan `by the use of which a practically constant consumption of the particular power employed for its rotation ismaintained no matter at what" velocity or revolutions rotated.

A still further object of this invention is to provide a device of the kind referred to in which surface friction tending to create slippage is to all practical intent eliminated, whilst when in operation there is no appreciable evidence of moment of inertia or any radius of gyration.

With the foregoing fundamental objects in view my invention consists essentially of a propeller or fan having blades of uniform per minute it may be concavo-convex cross section and diagonally opposed hyperbolically curved edges, said blades being tangentially and rigidly supported relative to their hub or axis of rotation.

In the further disclosure of the invention reference is to be had to the accompanying sheet of explanatory drawings constituting a part of this specification and in which like characters of reference designate the a same or corresponding parts in all the views:

Figure 1 is an end view of a propeller or fan embodying my present invention.

F1gure 2 1s a side vlew ofthe same; and,

Figure 3`is adetail view of one ofthe blades and its supporting members detached from the propeller hub.

Referring more particularly to the views the numeral 10' designates a tubular. hub which is appropriately provided with end ianges llfbetween which and cap ianges or washers `12 the ends of the blade support- `ing arms lg'are'securely held by bolts or set-screws 14 as later on explained.

Each blade 15 is conveniently though not essentially made from a sheet metall blank of uniform thickness and moulded or bent to concave-convex throughout its entire length and said blade is fashioned with diagonally opposed relatively parallel edges 16, 16, and other diagonally opposed edges formed in hyperbolic curves 17, 17. Each blade 15 isl also suitably fashioned so that lthe tips 18, 18, thereof are turned directly y central relative to its axial length in the manner described in f Patent #1,372,755. l ;Welde'd or otherwise appropriately atprior United States tached to v"or formed integral with each blade 15 are a pair of the opposed supporting arms 13 the free ends whereof are suitably fashioned-to provide 'segmental ends 19 having V'notched out parts 20 adapted to snugly abut the bushing 21 of the propeller hub 10; and it will be clearly seen on an examination of Figures 1 and 2 more particularly that the three segmental ends 19 at each side of the hub 10 snugly abut each other labout the bushing 21 and further that they are firmly clamped between the end flanges 11 and cap flanges 12 by the bolts or set screws 14.

When a propeller constructed as above set forth is employed for separation purposes it is to be observed that the three or more blades 15 being disposed equi-dis.- tantly around the hub 10 and due to their peculiar formation and manner of mounting or tangential disposition relative thereto they will be in a measure resiliently supported, and when in rotation will create what may be termed open-ended buckets, open not only at each end but also on the inner side or surface facing the axis of ro tation, and I wish lhere to particularly point outA that I have discovered by actual tests that my equi-potential propeller when in use permits of a slight variation or reduc-= tion in the pitch due to the resilient diform movements of the buckets. Still further I have discovered that when my `inyention is employed esta fan 'the toiniieintnro of 'the Vair entrained thereby-as read from a ther- Inoniftton-ol1oi absolutely no riso iiflioioao the air entrainedlA anlt'ordin'ary'farfini variably shows a rise in temperature.

Furthermore it is to be remarked that the exterior of the buckets formedyby the rotating blades l and the inountings thereof experience no obstrctionto 'their yassage through thel airforj .otherelementfpro u'ce'no side currents, nor 'any' audible sound or vibration, nor any 4increase in temperature; and are in' fact'equifpotential surfaces.4

It is to be Vmost particularly remarked that when my improved propeller is used `as such that is to "say, for. purposes of pro- :pulsion or` ventilation -the supporting of the blades l5 relative4 to' theghu-bf lO must be f'gd; tlint iS 'to Sonthere must inet be any resilient; tendency,existent.A

Whilst-I have-shown and described one practical embodiment and referred to application of 'my present 'invention which is particularly adapted for service as aventilating fan, or'airsl1ip propeller; the same isnotfto be construed as conclusive as" it- Will be perfectly obvious that heavier types `and other forms of the blades vmaybe 'forged'or caston identical lines for use on the'fpropellers of aquatic vessels and similarly the method of mounting said vblades relative( tol the hub" 10 may be "other than thatspeciiically described; and l Wish it clearly understood that Ifdofnot limit or restrict myself in any Way to the specific embodiment disclosed but deem myself 'at liberty to'make such changes or variation provide opposed surfaces of uniformly concavo-convex cross section throughout their loneth ond having the tips. thonoof Spinally twisted into a lino dirootly Qontrol thereof. "-2- ,A Propollor'inluding ohilb for nttaohinont ,on Aa rotntnblo Shaft nndblniloS rigidly suppoitod inftnngontiol and obliquo relation relatyo to the'longtiidinol anis of Sofl blib, oooh o Soidtlads haring a cross Sootional-nrfoooof uniform @Nature and boing formeel ultil onposool Parallel .and

tnt/ins oontiniiotions of thoiinnnlll aiss, and 'said ,blade being also Spinelli twisted at dits ,medialpoition ftol hote the tips. thereof lie in a longitudinalpl'ane and,Y 'iiryedto- Ward each other.k

inson n rototnblo' Shot-t, 'bllo tloiotd .about sind hiiioin @qu-sinned folntioiionth of Sold blades, boing formed to poiitlo P- posed surfaces if luniformly concav convex @we sottolineano@'non iinaii'aifi hiring tnfities. Sniferllatrlsttd 'inten lino directly,l central thereof, and opposed i arms rigidly Siiiiiioftngili ,lola-Qd@ oeftd yarms beingsattaohed at yone end "and .the v other armiat other. .the In tosti-noni Wlionoi lf olii? ina ,Sanntnro- 3. A prl peller including a hub for mounti 

